This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, batch-inspected for consistency.

Bellows Transom Repair Kit – Fits Volvo Penta SX Series & OMC Cobra (Replaces 3854127, 3852352, 3850426)

$94.99

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You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

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Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Bellows Transom Repair Kit – Fits Volvo Penta SX Series & OMC Cobra (Replaces 3854127, 3852352, 3850426) offers a complete service solution with dual-brand compatibility across Volvo Penta SX-C and SX-M sterndrives (1994–1998) and OMC Cobra models (1986–1993). The kit includes the core components needed to prevent water intrusion and protect critical sterndrive and gimbal systems.

It serves as a direct interchange for primary Volvo Penta, OMC, Sierra, and GLM component part numbers, ensuring a reliable fit for the specified engine models.

Engineered for clamp-on installation using the included stainless steel hardware.
Constructed from a durable, marine-grade rubber compound that resists UV, ozone, and saltwater.
Comprehensive kit includes U-joint bellows, exhaust bellows, water inlet hose, and a complete sealing kit.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Volvo Penta	22197130 / 23075752 / 3841481	Kit Reference
Volvo Penta / OMC	3854127	U-Joint Bellows
Volvo Penta / OMC	3852352	Water Inlet Hose
Volvo Penta / OMC	3850426	Exhaust Bellows
OMC	983973 / 987467	U-Joint Bellows Cross-Reference
OMC	911830	Water Inlet Hose Cross-Reference
OMC	914036 / 767724	Exhaust Bellows Cross-Reference
Sierra	18-2765	Aftermarket U-Joint Bellows
Sierra	18-1074	Aftermarket Exhaust Bellows
GLM	89200	Aftermarket U-Joint Bellows
GLM	89190	Aftermarket Exhaust Bellows

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Fitment covers select Volvo Penta SX and DP series sterndrives from 1994 through 1998.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Volvo Penta	SX-C 3.0L	135	4-Stroke	1994–1998	3854127, 3852352, 3850426	Single propeller drive
Volvo Penta	SX-C 4.3L	190	4-Stroke	1994–1998	3854127, 3852352, 3850426	V6 configuration
Volvo Penta	SX-M 5.0L	220	4-Stroke	1994–1998	3854127, 3852352, 3850426	V8 standard output
Volvo Penta	SX-R 5.7L	250	4-Stroke	1994–1998	3854127, 3852352, 3850426	High performance V8
Volvo Penta	SX-S 5.8L	275	4-Stroke	1994–1998	3854127, 3852352, 3850426	Ford-based V8 engine
Volvo Penta	DP-S 7.4L	310	4-Stroke	1997–1998	3854127, 3850426	Large displacement V8
Volvo Penta	DP-SM 8.2L	350	4-Stroke	1997–1998	3854127, 3850426	Marine-specific big block

Fitment covers OMC Cobra sterndrives from 1986 through 1993.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
OMC	Cobra 3.0L	140	4-Stroke	1986–1993	3854127, 3852352, 3850426	All clutch dog models
OMC	Cobra 4.3L V6	175-205	4-Stroke	1986–1993	3854127, 3852352, 3850426	Standard and High Output
OMC	Cobra 5.0L V8	230-260	4-Stroke	1986–1993	3854127, 3852352, 3850426	Ford and GM engine blocks
OMC	Cobra 5.7L V8	260-300	4-Stroke	1986–1993	3854127, 3852352, 3850426	Standard and High Output
OMC	Cobra 5.8L V8	280-320	4-Stroke	1986–1993	3854127, 3852352, 3850426	Ford 351W based engine
OMC	King Cobra 7.4L V8	330-370	4-Stroke	1987–1993	3854127, 3850426	Verify water hose compatibility

Technical Specs

Product Type: Marine Transom Bellows Repair Kit
Installation: Clamp-on with stainless steel hardware
Fuel Compatibility: All marine fuel types
Connection: Heavy-duty stainless steel clamps
Housing Material: EPDM/Neoprene rubber compound
Housing Color: Marine-grade black
Dimensions: U-Joint: 5.5" × 5.13" × 5.5", Exhaust: 7" L × 3" large end × 2.5" small end
Weight: Approximately 3.8 lbs (1.7 kg)
Fitting Type: Flexible rubber bellows with clamp connections
Working Pressure: Up to 57 PSI (component dependent)
Burst Pressure: 3× working pressure minimum
Operating Temperature: -65°F to +350°F (-54°C to +177°C)
Warranty: 12 months manufacturer warranty
Other Technical Attributes: UV resistant, ozone resistant, saltwater compatible

What’s in the Box

1 x U-Joint Bellows Assembly (Replaces 3854127/983973/987467)
1 x Water Inlet Hose (Replaces 3852352/911830)
1 x Exhaust Bellows Assembly (Replaces 3850426/914036/767724)
1 x Complete Sealing Kit (Replaces 3852537/3852560)
1 x Installation Hardware Set (Stainless steel clamps and mounting hardware)

Installation Notes

Disconnect the boat's battery and ensure the sterndrive is trimmed up to provide adequate access.
Remove the outdrive assembly according to the manufacturer's service manual procedures.
Carefully cut and remove the old clamps and bellows, noting the orientation and position of each one.
Thoroughly clean all mating surfaces on the transom shield and bell housing, removing any old sealant or debris.
Install the new water inlet hose, exhaust bellows, and U-joint bellows using the new clamps provided in the kit.
Confirm all bellows are properly seated in their grooves and tighten the clamps to the specified torque.
Reinstall the outdrive, carefully aligning the U-joint shaft.
After reassembly, perform an in-water leak test at the dock before operating the boat at speed.

Troubleshooting & FAQ

How do I confirm this kit fits my specific engine?

This kit is designed for Volvo Penta SX-C/SX-M drives from 1994–1998 and OMC Cobra drives from 1986–1993. Please verify your exact model and year against our compatibility tables. Pay close attention to notes for certain models like the King Cobra and DP-S, which may have unique requirements not covered by this standard kit.

What are the signs my old bellows have failed?

Common symptoms of bellows failure include discovering water in the bilge (a sign of a U-joint bellows leak), hearing a roaring or grinding noise from the transom area (indicating a water-damaged gimbal bearing), or observing visible cracks, splits, or deterioration on the rubber components during a visual inspection.

How often should bellows be replaced?

For preventative maintenance, it is recommended to inspect bellows annually for any signs of wear or damage. Full replacement is advised every 3–5 years, with the shorter interval recommended for boats used in saltwater or stored in the water.

Can I replace just one of the bellows instead of the whole kit?

While technically possible, it is strongly recommended to replace the U-joint bellows, exhaust bellows, and water hose simultaneously. These components are exposed to the same operating conditions and age at a similar rate. Replacing them all at once is the most reliable long-term repair.

I have a leak after installation. What should I check?

First, verify that all clamps are correctly positioned within the grooves on the bellows and are tightened to the manufacturer's recommended torque. Ensure the bellows are not twisted or pinched and are fully seated against the transom and bell housing surfaces. Any debris left on the sealing surfaces can also cause a leak.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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